Hermann alt



UNITED STATEs PATENT 'FFICE.

HERMANN ALT, OF WIESBADEN, AND EDUARD OULMANN, OF MULHAUSEN, GERMANY, ASSIGNORS'TO KALLE 82: 00., OF BIEBRIOH, GERMANY.

PROCESS OF DYElN-G WITH QUINONOXIM COLORS.

SPECIFICATION forming part of Letters Patent No. 615,232, dated December 6, 1898.

Application filed January 23, 1898. Serial No. 668,329. (No specimens.)

To all whom it may concern:

Be it known that we, HERMANN ALT, a subject of the Emperor of Germany, residing at Wiesbaden, and EDUARD OULMANN, a citizen of Switzerland, residing at Miilhausen- Elsass, Germany, (assignors to KALLE & 00., of Biebrioh onthe Rhine, Germany,) have invented a certain new and useful Improvement in Producing and Fixing Quinonoxiln Coloring-Matters on 'lextile Fibers, of which the following is a specification.

The application of quinonoxim coloringlnatters (nitrosophenols) in cloth-printing has up to now been a limited one on account of various diificulties in their employmentfor instance, in the steaming process-which arise from the peculiar nature of this class of coloring-matters. Still it was looked upon as desirable to overcome these difficulties, because these dyestuffs are distinguished by an excellent fastness, especially against light.

We have now succeeded in overcoming'the difficulties above referred to by proceeding in the following manner: Contrary to the old process of printing-the finished dyestuff and fixing it upon the fiber by steaming the printed fabric We produce the quinonoxims, or, rather, lakes of the same, directly on the fiber without applying the steaming process at all. If a fabric is impregnated with a mixture consisting of a phenol-like, for instance, the naphthols, dioxynaphthalenes, resorcin, and the like-a mordant suitable for quinonoxim coloring-matters, such as copperas, and an acid like tartaric acid, and if this fabric is dried and passed through a neutral and preferably boiling-hot nitrite solution, the dyestufi is at once developed and at the same time fixed on the fiber. Of course the same result is obtained, if a preViously-mordanted fabric is impregnated with'a mixture of a phenol and an acid and passed through a nitritesolution. The various ingredients necessary for the color-lake intended to be formed can also be applied to the fiber in different order or different mixture. The fabric can, for instance, be impregnated with a mixture of a phenolate and nitrite and can be introduced afterward into an acidulated mordant-bath, or it can be impregnated with nitrite and a mordant and passed through an acid or neutral solution of a phenol, &c.

All these varipassing them between hot plates and introduced into a boiling-hot sodium-nitrite solution of, for instance, five per cent. In this manner green shades are obtained. Instead of printing the mixture with the aid of a thickening we can also pad'the cloth with an aqueous solution of the mixture, dry it, and develop the colorin the described manner.

Example 2.The cloth is padded or printed with a mixture of two hundred and twentyeight grams alpha-naphthol, eight hundred grams acetin, two hundred and eighty grams copperas,one hundred and fifty grams tartaric acid, four hundred grams water or thickening, respectively, and the color is then developed,

after drying the goods, in a boiling nitritebath. In this manner also green shades are obtained.

We have further found that caustic sodalye and other substances which mechanically or chemically prevent the formation or fixation of the coloring-matters may be employed with good result as discharges in the abovedescribed printing or padding processes.

Now what we claim is The process of producing and at the same time fixing quinonoxim coloring-matters also known as nitrosophenols on the textile fiber by impregnating the goods with a mixture consisting of a phenol, a suitable acid or acid salt and a mordant adapted for the fixation of quinonoxim coloring-matters, and by passing said fabrics subsequently through a hot nitrite solution.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HERMANN ALT. L. 8.] EDUARD GULMANN. L. 3.] \Vitnesses:

W. HANSING,

HEINRICH MISCHLER. 

